composer(deps-dev): Update phpunit/phpunit requirement from 9.6.19 to…

… 9.6.20 (#195)

Updates the requirements on
[phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to
permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/sebastianbergmann/phpunit/releases">phpunit/phpunit's
releases</a>.</em></p>
<blockquote>
<h2>PHPUnit 9.6.20</h2>
<h3>Changed</h3>
<ul>
<li>Updated dependencies (so that users that install using Composer's
<code>--prefer-lowest</code> CLI option also get recent versions)</li>
</ul>
<hr />
<p><a href="https://docs.phpunit.de/en/9.6/installation.html">How to
install or update PHPUnit</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/sebastianbergmann/phpunit/blob/9.6.20/ChangeLog-9.6.md">phpunit/phpunit's
changelog</a>.</em></p>
<blockquote>
<h2>[9.6.20] - 2024-07-10</h2>
<h3>Changed</h3>
<ul>
<li>Updated dependencies (so that users that install using Composer's
<code>--prefer-lowest</code> CLI option also get recent versions)</li>
</ul>
<h2>[9.6.19] - 2024-04-05</h2>
<h3>Changed</h3>
<ul>
<li>The namespaces of dependencies are now prefixed with
<code>PHPUnitPHAR</code> instead of just <code>PHPUnit</code> for the
PHAR distribution of PHPUnit</li>
</ul>
<h2>[9.6.18] - 2024-03-21</h2>
<h3>Changed</h3>
<ul>
<li><a
href="https://redirect.github.com/sebastianbergmann/phpunit/issues/5763">#5763</a>:
Release nullable type changes for PHPUnit 9.6</li>
</ul>
<h2>[9.6.17] - 2024-02-23</h2>
<h3>Changed</h3>
<ul>
<li>Improve output of <code>--check-version</code> CLI option</li>
<li>Improve description of <code>--check-version</code> CLI option</li>
<li>Show help for <code>--manifest</code>, <code>--sbom</code>, and
<code>--composer-lock</code> when the PHAR is used</li>
</ul>
<h3>Fixed</h3>
<ul>
<li><a
href="https://redirect.github.com/sebastianbergmann/phpunit/issues/5712">#5712</a>:
Update dependencies for PHAR distribution of PHPUnit 9.6</li>
</ul>
<h2>[9.6.16] - 2024-01-19</h2>
<h3>Changed</h3>
<ul>
<li>Make PHAR build reproducible (the only remaining differences were in
the timestamps for the files in the PHAR)</li>
</ul>
<h3>Fixed</h3>
<ul>
<li><a
href="https://redirect.github.com/sebastianbergmann/phpunit/issues/5516">#5516</a>:
Assertions that use the <code>LogicalNot</code> constraint
(<code>assertNotEquals()</code>,
<code>assertStringNotContainsString()</code>, ...) can generate
confusing failure messages</li>
<li><a
href="https://redirect.github.com/sebastianbergmann/phpunit/issues/5666">#5666</a>:
<code>--no-extensions</code> CLI option does not work</li>
<li><a
href="https://redirect.github.com/sebastianbergmann/phpunit/issues/5673">#5673</a>:
Confusing error message when migration of a configuration is requested
that does not need to be migrated</li>
</ul>
<h2>[9.6.15] - 2023-12-01</h2>
<h3>Fixed</h3>
<ul>
<li><a
href="https://redirect.github.com/sebastianbergmann/phpunit/issues/5596">#5596</a>:
<code>PHPUnit\Framework\TestCase</code> has <code>@internal</code>
annotation in PHAR</li>
</ul>
<h2>[9.6.14] - 2023-12-01</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/49d7820565836236411f5dc002d16dd689cde42f"><code>49d7820</code></a>
Prepare release</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/4b4161b79fe49bdcd5e6d54279f968866fdd80b4"><code>4b4161b</code></a>
Merge branch '8.5' into 9.6</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/172ba97bcf97ae6ef86ca256adf77aece8a143fe"><code>172ba97</code></a>
Prepare release</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/7f343c4d82209679dd32d24c8cb47645aa9268c2"><code>7f343c4</code></a>
Merge branch '8.5' into 9.6</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/5c0a51449c5fbacb930097d38468814a559c7deb"><code>5c0a514</code></a>
Bump dependencies (so that users that install using Composer's
--prefer-lowes...</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/d229f5800280c68f1c5fc28b132bc64ff5ed3dd4"><code>d229f58</code></a>
Merge branch '8.5' into 9.6</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/2f06a166cd7d48ef76ab27d6db9ccc5a2866e0d0"><code>2f06a16</code></a>
Update tools</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/07da7f5d51ff0bc9b0ea757be084a57e174b1312"><code>07da7f5</code></a>
Merge branch '8.5' into 9.6</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/3c2c582c21ab23e410281cca1809c5fd398520e0"><code>3c2c582</code></a>
Update dependencies</li>
<li><a
href="https://github.com/sebastianbergmann/phpunit/commit/c49a36cea5f60ad5b6754b9f84a297796f923848"><code>c49a36c</code></a>
Merge branch '8.5' into 9.6</li>
<li>Additional commits viewable in <a
href="https://github.com/sebastianbergmann/phpunit/compare/9.6.19...9.6.20">compare
view</a></li>
</ul>
</details>
<br />

<details>
<summary>Most Recent Ignore Conditions Applied to This Pull
Request</summary>

| Dependency Name | Ignore Conditions |
| --- | --- |
| phpunit/phpunit | [>= 11.a, < 12] |
| phpunit/phpunit | [>= 10.a, < 11] |
</details>


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composer.json

@@ -32,7 +32,7 @@
     },
     "require-dev": {
         "ext-json": "*",
-        "phpunit/phpunit": "9.6.19",
+        "phpunit/phpunit": "9.6.20",
         "roave/security-advisories": "dev-latest"
     },
     "prefer-stable": true,